From 26a029d407be480d791972afb5975cf62c9360a6 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Fri, 19 Apr 2024 02:47:55 +0200 Subject: Adding upstream version 124.0.1. Signed-off-by: Daniel Baumann --- mfbt/Opaque.h | 41 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 41 insertions(+) create mode 100644 mfbt/Opaque.h (limited to 'mfbt/Opaque.h') diff --git a/mfbt/Opaque.h b/mfbt/Opaque.h new file mode 100644 index 0000000000..e5dc84f159 --- /dev/null +++ b/mfbt/Opaque.h @@ -0,0 +1,41 @@ +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ +/* vim: set ts=8 sts=2 et sw=2 tw=80: */ +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +/* An opaque integral type supporting only comparison operators. */ + +#ifndef mozilla_Opaque_h +#define mozilla_Opaque_h + +#include + +namespace mozilla { + +/** + * Opaque is a replacement for integral T in cases where only comparisons + * must be supported, and it's desirable to prevent accidental dependency on + * exact values. + */ +template +class Opaque final { + static_assert(std::is_integral_v, + "mozilla::Opaque only supports integral types"); + + T mValue; + + public: + Opaque() = default; + explicit Opaque(T aValue) : mValue(aValue) {} + + bool operator==(const Opaque& aOther) const { + return mValue == aOther.mValue; + } + + bool operator!=(const Opaque& aOther) const { return !(*this == aOther); } +}; + +} // namespace mozilla + +#endif /* mozilla_Opaque_h */ -- cgit v1.2.3